How To Fix NET016 - DNS server for name resolution

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 016

• Message text: DNS server for name resolution

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message NET016 - DNS server for name resolution ?

  The SAP error message NET016 typically indicates an issue with DNS (Domain Name System) resolution. This error occurs when the SAP system is unable to resolve the hostname of a server or service to an IP address. Here are the common causes, solutions, and related information for this error:
  Causes:
  
  Incorrect Hostname: The hostname specified in the SAP configuration may be incorrect or misspelled.
  DNS Configuration Issues: The DNS server may not be properly configured, or the SAP system may not be able to reach the DNS server.
  Network Issues: There may be network connectivity problems preventing the SAP system from accessing the DNS server.
  Hosts File Misconfiguration: The local hosts file may not contain the correct mappings for the hostname.
  Firewall Restrictions: Firewalls may be blocking DNS queries or responses.
  
  Solutions:
  
  
  Verify Hostname: Check the hostname in the SAP configuration and ensure it is correct. You can use the ping command to test if the hostname resolves correctly.
  
  
  Check DNS Configuration:
  
  Ensure that the DNS server settings are correctly configured in the operating system.
  You can use tools like nslookup or dig to test DNS resolution from the command line.
  
  
  
  Network Connectivity:
  
  Check the network connection to ensure that the SAP system can reach the DNS server.
  Use traceroute or ping to diagnose any network issues.
  
  
  
  Update Hosts File:
  
  If DNS resolution is not working, consider adding the hostname and its corresponding IP address to the local hosts file (e.g., /etc/hosts on Unix/Linux or C:\Windows\System32\drivers\etc\hosts on Windows).
  
  
  
  Firewall Settings:
  
  Review firewall settings to ensure that DNS traffic (typically UDP port 53) is allowed.
  
  
  
  SAP Profile Parameters:
  
  Check the SAP profile parameters related to network settings. Ensure that parameters like rdisp/mshost and rdisp/msserv are correctly set.
  
  
  
  Restart Services: After making changes, restart the SAP services or the entire server to ensure that the changes take effect.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to the NET016 error.
  Logs: Review the SAP system logs (e.g., dev_w0, dev_rfc) for additional error messages that may provide more context.
  Documentation: Refer to SAP documentation for network configuration and troubleshooting.
  
  By following these steps, you should be able to diagnose and resolve the NET016 error related to DNS server name resolution in your SAP environment.